Building block



FIG. 1 is a perspective view of the building block showing the newdesign;

FIG. 2 is a top view thereof;

FIG. 3 is a bottom view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a front view thereof;

FIG. 7 is a back view thereof;

FIG. 8 is a first perspective view thereof shown interlockingback-to-back with a similar block in broken lines;

FIG. 9 is a second perspective view thereof shown interlockingback-to-back with a similar block in broken lines; and,

FIG. 10 is a top view thereof shown interlocking back-to-back with asimilar block in broken lines.

Wherein the broken lines in FIGS. 8-10 form no part of the claimeddesign.

CLAIM The ornamental design for a building block, as shown anddescribed.